[Bug 27816] DVI corrupted output on dual setup VGA + DVI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27816

--- Comment #8 from untitled.no4 at gmail.com 2010-04-24 06:07:45 PDT ---
I have some more information about the issue.

I've decided to see whether running Kubuntu RC as a live CD also shows these
problems and it doesn't. The computer starts with VGA-0 enabled and when I
enable DVI-0 it works well.
Went a step further and re-installed. Check again and all was working fine.
Then another step, enabled xorg-edgers and installed updates, and that's where
the problems started.

While doing this I noticed that at one point the DVI monitor was displaying an
image (corrupted), but that it was shown as disabled, while the laptop's
monitor was shown as enabled. I disabled the LCD monitor and enabled DVI-0 and
the image on DVI was suddenly good. I then thought that perhaps the problem is
that DVI is enabled using the settings for the LCD (DVI is 1440x900, LCD is
1680x1050). I rebooted and enabled the LCD, then disabled the LCD and enabled
DVI and it was working well.
So, it looks to me as if when both external monitors are connected when X
starts the system somehow sets the DVI screen with the settings of the LCD
monitor. While if I disconnect the VGA monitor everything works fine.

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